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Science 5 November 1999:
Vol. 286. no. 5442, pp. 1065 - 1067
DOI: 10.1126/science.286.5442.1065
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News of the Week

PHYSICS:
Gravity's Gravity Vindicates Einstein

Andrew Watson

Between them, general relativity--Einstein's theory linking the force of gravity to the geometry of space and time--and quantum theory explain all of nature's forces, and yet physicists have been unable to unite the two. Now, a group of researchers has sought to do this by looking for a difference in the way gravity acts on mass and on gravitational energy itself. Such a difference is expected in some scenarios of a deep connection between gravity and the quantum world. The search, however, came up empty.

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Science. ISSN 0036-8075 (print), 1095-9203 (online)